Bimasri, John, and Nely Murniati. 2022. “Remediation of Ultisol Soil by Biosilica for Cultivation of Soybean (Glycine Max)”. JURNAL BUDIDAYA PERTANIAN 18 (1), 67-73. https://doi.org/10.30598/10.30598/jbdp.2022.18.1.67.